You are originally 1.0 m beneath the surface of a pool. if you dive to 2.0 m beneath the surface, what happens to the absolute pressure on you?
a. it does not change.
b. it less than doubles.
c. it more than doubles.
d. it quadruples.
e. it doubles.

It less than doubles.

Explanation:

It is given that,

You are originally 1.0 m beneath the surface of a pool, h = 1 m

If you dive to 2.0 m beneath the surface, h' = 2 m

The absolute pressure acting on the person is given by :

is the atmospheric pressure

If h = 1

If h = 2

When the height becomes doubles, the absolute pressure on you becomes less than doubles. Hence, the correct option is (B).

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.